Reaction model for kinetic of cobalt dissolution in carbonate/bicarbonate media

被引：25

作者：

Calderon, J. A. ^{[2
]}

Barcia, O. E. ^{[1
]}

Mattos, O. R. ^{[1
]}

机构：

[1] PEMM COPPE UFRJ, Lab Corrosao Prof Manoel Castro, BR-2194597 Rio De Janeiro, Brazil

[2] Univ Antioquia, Corros & Protect Grp, Medellin, Colombia

来源：

CORROSION SCIENCE | 2008年 / 50卷 / 07期

关键词：

cobalt; carbonate/bicarbonate; EIS; cobalt electrodissolution; reaction model;

D O I：

10.1016/j.corsci.2008.04.013

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cobalt dissolution in a carbonate/bicarbonate media was studied in order to elucidate the kinetic of the metal corrosion processes. Steady-state polarization and electrochemical impedance measurements were carried out during the active metal dissolution at different electrode rotation speeds. A reaction mechanism is presented in order to explain the metal dissolution: cobalt electrodissolution starts with the formation of intermediate (CoHCO3)(ads) on the electrode surface, followed by the simultaneous formation of a Co(CO3)(2)(2-) complex and the formation of a CoO film. Mass transport is characterised by diffusion of the Co(CO3)(2)(2-) complex away from the electrode. The reaction model was validated by an accurate simulation of the experimental steady-state polarisation and impedance measurements. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：2101 / 2109

页数：9